Center for Strategic Scientific Initiatives (CSSI). Presented By: Michelle Berny-Lang. Overview of Mission and Purpose. Center for Strategic Scientific Initiatives (CSSI) Overview. CSSI Office of the Director Office of Cancer Nanotechnology Research (OCNR)By holdren
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Aberrations. Q1. In terms of Abbe Number, the best combination of positive and negative elements to make an effective achromatic lens doublet would be:. Positive element 57.55, negative element 25.76 Positive element 25.76, negative element 57.55
Aberrations. Spherical Aberration. Problem : Lenses or mirrors whose faces are curved like part of a sphere are cheapest & easiest to make They refract/reflect light entering at the edges more than the center. Aberration : Light is not all focused to the same point
ABERRATIONS. The Perfect Image. There is no such thing as a perfect image. All light rays passing through optical systems are subject to distortions. Aberrations.
Chromosomal Aberrations. Changes in the numbers of chromosomes Polyploidy Extra complete sets of chromosomes 3N, 4N, 5N, etc. Aneuploidy Extra or missing single chromosomes 2N + 1, 2N -1, etc. Chromosomal Aberrations. Changes in structure Changes in the number of genes
Chromosomal Aberrations. Can be caused either by non-disjunction (failure of whole chromosomes to separate during meiosis) translocation (bits of chromosomes that are re-attached to other chromosomes).
Hope College, PHYS 352, Spring 2013. Lens Aberrations. Aberration: a departure from the paraxial limit. Paraxial limit: (1) Rays are kept close to the optic axis. (2) Small angle approximation (1 st Order). 5 th Order 3 rd Order 1 Order.
Lens Aberrations( 수차 ). 전자현미경에 사용되는 전자기 렌즈들은 렌즈를 통과하는 전자들의 회전 때문에 여러 수차가 생긴다 . 구면수차 (spherical aberration) 색수차 (chromatic aberration) 비점 (astigmatism). Spherical Aberrations( 구면수차 ). 빛이나 전자가 렌즈의 중앙 (center) 을 지날 때와 모서리 (edge) 부분을 지날 때 각각 다른 focal length 를 가진다 . Center: long focal length
Books and aberrations. J. Greivenkamp, “Field Guide to Geometrical Optics,” SPIE Press, 2004. V. N. Mahajan, Optical Imaging and Aberrations, Part I,” SPIE Press, 1998. V. N. Mahajan, Optical Imaging and Aberrations, Part II,” SPIE Press, 1998.